/*      $NetBSD: mk48txx.c,v 1.28 2020/01/01 19:24:03 thorpej Exp $ */
/*-
* Copyright (c) 2000 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Paul Kranenburg.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

/*
* Mostek MK48T02, MK48T08, MK48T59 time-of-day chip subroutines.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: mk48txx.c,v 1.28 2020/01/01 19:24:03 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/errno.h>

#include <sys/bus.h>
#include <dev/clock_subr.h>
#include <dev/ic/mk48txxreg.h>
#include <dev/ic/mk48txxvar.h>

int mk48txx_gettime_ymdhms(todr_chip_handle_t, struct clock_ymdhms *);
int mk48txx_settime_ymdhms(todr_chip_handle_t, struct clock_ymdhms *);
uint8_t mk48txx_def_nvrd(struct mk48txx_softc *, int);
void mk48txx_def_nvwr(struct mk48txx_softc *, int, uint8_t);

const struct {
       const char *name;
       bus_size_t nvramsz;
       bus_size_t clkoff;
       int flags;
#define MK48TXX_EXT_REGISTERS   1       /* Has extended register set */
} mk48txx_models[] = {
       { "mk48t02", MK48T02_CLKSZ, MK48T02_CLKOFF, 0 },
       { "mk48t08", MK48T08_CLKSZ, MK48T08_CLKOFF, 0 },
       { "mk48t18", MK48T18_CLKSZ, MK48T18_CLKOFF, 0 },
       { "mk48t59", MK48T59_CLKSZ, MK48T59_CLKOFF, MK48TXX_EXT_REGISTERS },
       { "ds1553", DS1553_CLKSZ, DS1553_CLKOFF, MK48TXX_EXT_REGISTERS },
};

void
mk48txx_attach(struct mk48txx_softc *sc)
{
       todr_chip_handle_t handle;
       int i;

       aprint_normal(": %s", sc->sc_model);

       i = __arraycount(mk48txx_models);
       while (--i >= 0) {
               if (strcmp(sc->sc_model, mk48txx_models[i].name) == 0)
                       break;
       }
       if (i < 0)
               panic("%s: unsupported model", __func__);

       sc->sc_nvramsz = mk48txx_models[i].nvramsz;
       sc->sc_clkoffset = mk48txx_models[i].clkoff;

       handle = &sc->sc_handle;
       handle->cookie = sc;
       handle->todr_gettime = NULL;
       handle->todr_settime = NULL;
       handle->todr_gettime_ymdhms = mk48txx_gettime_ymdhms;
       handle->todr_settime_ymdhms = mk48txx_settime_ymdhms;

       if (sc->sc_nvrd == NULL)
               sc->sc_nvrd = mk48txx_def_nvrd;
       if (sc->sc_nvwr == NULL)
               sc->sc_nvwr = mk48txx_def_nvwr;

       todr_attach(handle);
}

/*
* Get time-of-day and convert to a `struct timeval'
* Return 0 on success; an error number otherwise.
*/
int
mk48txx_gettime_ymdhms(todr_chip_handle_t handle, struct clock_ymdhms *dt)
{
       struct mk48txx_softc *sc;
       bus_size_t clkoff;
       int year;
       uint8_t csr;

       sc = handle->cookie;
       clkoff = sc->sc_clkoffset;

       /* enable read (stop time) */
       csr = (*sc->sc_nvrd)(sc, clkoff + MK48TXX_ICSR);
       csr |= MK48TXX_CSR_READ;
       (*sc->sc_nvwr)(sc, clkoff + MK48TXX_ICSR, csr);

       dt->dt_sec = bcdtobin((*sc->sc_nvrd)(sc, clkoff + MK48TXX_ISEC));
       dt->dt_min = bcdtobin((*sc->sc_nvrd)(sc, clkoff + MK48TXX_IMIN));
       dt->dt_hour = bcdtobin((*sc->sc_nvrd)(sc, clkoff + MK48TXX_IHOUR));
       dt->dt_day = bcdtobin((*sc->sc_nvrd)(sc, clkoff + MK48TXX_IDAY));
       dt->dt_wday = bcdtobin((*sc->sc_nvrd)(sc, clkoff + MK48TXX_IWDAY));
       dt->dt_mon = bcdtobin((*sc->sc_nvrd)(sc, clkoff + MK48TXX_IMON));
       year = bcdtobin((*sc->sc_nvrd)(sc, clkoff + MK48TXX_IYEAR));

       if (sc->sc_flag & MK48TXX_HAVE_CENT_REG) {
               year += 100*bcdtobin(csr & MK48TXX_CSR_CENT_MASK);
       } else {
               year += sc->sc_year0;
               if (year < POSIX_BASE_YEAR &&
                   (sc->sc_flag & MK48TXX_NO_CENT_ADJUST) == 0)
                       year += 100;
       }

       dt->dt_year = year;

       /* time wears on */
       csr = (*sc->sc_nvrd)(sc, clkoff + MK48TXX_ICSR);
       csr &= ~MK48TXX_CSR_READ;
       (*sc->sc_nvwr)(sc, clkoff + MK48TXX_ICSR, csr);

       return 0;
}

/*
* Set the time-of-day clock based on the value of the `struct timeval' arg.
* Return 0 on success; an error number otherwise.
*/
int
mk48txx_settime_ymdhms(todr_chip_handle_t handle, struct clock_ymdhms *dt)
{
       struct mk48txx_softc *sc;
       bus_size_t clkoff;
       uint8_t csr;
       int year;
       int cent;

       sc = handle->cookie;
       clkoff = sc->sc_clkoffset;

       if ((sc->sc_flag & MK48TXX_HAVE_CENT_REG) == 0) {
               cent = 0;
               year = dt->dt_year - sc->sc_year0;
               if (year > 99 &&
                   (sc->sc_flag & MK48TXX_NO_CENT_ADJUST) == 0)
                       year -= 100;
       } else {
               cent = dt->dt_year / 100;
               year = dt->dt_year % 100;
       }

       /* enable write */
       csr = (*sc->sc_nvrd)(sc, clkoff + MK48TXX_ICSR);
       csr |= MK48TXX_CSR_WRITE;
       (*sc->sc_nvwr)(sc, clkoff + MK48TXX_ICSR, csr);

       (*sc->sc_nvwr)(sc, clkoff + MK48TXX_ISEC, bintobcd(dt->dt_sec));
       (*sc->sc_nvwr)(sc, clkoff + MK48TXX_IMIN, bintobcd(dt->dt_min));
       (*sc->sc_nvwr)(sc, clkoff + MK48TXX_IHOUR, bintobcd(dt->dt_hour));
       (*sc->sc_nvwr)(sc, clkoff + MK48TXX_IWDAY, bintobcd(dt->dt_wday));
       (*sc->sc_nvwr)(sc, clkoff + MK48TXX_IDAY, bintobcd(dt->dt_day));
       (*sc->sc_nvwr)(sc, clkoff + MK48TXX_IMON, bintobcd(dt->dt_mon));
       (*sc->sc_nvwr)(sc, clkoff + MK48TXX_IYEAR, bintobcd(year));

       /*
        * If we have a century register and the century has changed
        * update it.
        */
       if ((sc->sc_flag & MK48TXX_HAVE_CENT_REG)
           && (csr & MK48TXX_CSR_CENT_MASK) != bintobcd(cent)) {
               csr &= ~MK48TXX_CSR_CENT_MASK;
               csr |= MK48TXX_CSR_CENT_MASK & bintobcd(cent);
               (*sc->sc_nvwr)(sc, clkoff + MK48TXX_ICSR, csr);
       }

       /* load them up */
       csr = (*sc->sc_nvrd)(sc, clkoff + MK48TXX_ICSR);
       csr &= ~MK48TXX_CSR_WRITE;
       (*sc->sc_nvwr)(sc, clkoff + MK48TXX_ICSR, csr);

       return 0;
}

int
mk48txx_get_nvram_size(todr_chip_handle_t handle, bus_size_t *vp)
{
       struct mk48txx_softc *sc;

       sc = handle->cookie;
       *vp = sc->sc_nvramsz;
       return 0;
}

uint8_t
mk48txx_def_nvrd(struct mk48txx_softc *sc, int off)
{

       return bus_space_read_1(sc->sc_bst, sc->sc_bsh, off);
}

void
mk48txx_def_nvwr(struct mk48txx_softc *sc, int off, uint8_t v)
{

       bus_space_write_1(sc->sc_bst, sc->sc_bsh, off, v);
}

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